from selenium import webdriver

wd = webdriver.Chrome()

wd.get('https://www.jianshu.com/sign_in')

element_c = wd.find_element_by_id('session_email_or_mobile_number')

element_c.send_keys('17866633217')

element_p = wd.find_element_by_id('session_password')

element_p.send_keys('test@666')

wd.find_element_by_id('sign-in-form-submit-btn').click()